'Arms' in the Bible

Then Ebed-melech the Cushite said to Jeremiah, "Please put {the rags} and {worn-out clothes} under the joints of your arms under the ropes," and Jeremiah did so.

And because of the wrath of the Lord this came about in Jerusalem and Judah, till he had sent them away from before him: and Zedekiah took up arms against the king of Babylon.